Land Rover Fuel Injection System Manual

							7 6
RR2400E
KEYI. Spherical bearing
2. Retaining clips 
(2)3. Countershaft assembly
4. Overtravel spring
5. Throttle spindle nut
6. Throttle return spring 
(2)7. Tab washer
8. Throttle stop lever
9. Throttle bracket assembly
10. Pop rivets 
(2)Remove throttle lever assembly
17.
18.
19.
20.
66Remove the six screws securing the plenum
chamber to the ram housing. Lift off the
plenum chamber.
Remove the hose from the air bypass valve
housing and plenum chamber air inlet pipe.
Unclip the cruise control actuator link. While
holding the throttle valve fully open release
the link from the countershaft assembly.
Carefully return the lever assembly to the
closed throttle position.
Release the tension on the inboard throttle
return spring and slide the spring along the
countershaft assembly to give access to the
throttle shaft nut.21.
22.
23.Bend back the the tabs of the lock washer.
While holding the throttle stop lever in the
closed position, release the nut until it is free
of the throttle valve shaft.
Release the tension on the outboard throttle
return spring.
24.Unhook and remove the over-travel spring.
ADDITION: SEPT. 88
‘.. . . 
						

							:
.t
,,,::FUEL INJECTIONSYSTEM
25. Remove the three bolts securing the throttle
bracket to the plenum chamber and withdraw
the bracket assembly.
26. Remove the tab washer and throttle stop lever
from the throttle valve shaft.
Inspect and overhaul throttle lever assembly31.
32.Pre-grease a new bush with 
Admax L3 or
Energrease LS3 assemble the bush into the
bearing retaining plates and pop-rivet the
assembly to the throttle bracket with two 4.7
mm 
(3116 in) diameter domed head rivets 9
mm (0.361 in) long.
Examinethe bearing surface of the
countershaft assembly. 
If worn fit a new
assembly, otherwise wind the throttle return
spring off the levers.
32
RR2308E27.
28.
29.
30.Remove the two retaining clips from either
side of the spherical bearing.
Remove the countershaft assembly from the
bearing.If the spherical bush appears to be worn,
dismantle as follows. Using a 
4,7 mm (3116 in)
diameter drill, drill out the two pop rivets
securing the spherical bearing to the throttle
bracket assembly.
Split the bearing assembly and discard the
bearing bush.
-RR2307E ‘9
:33. Wind a new spring onto the countershaft
assembly noting that the small hooked end of
the spring is wound on first.
RR2309E
’.34. Pre-grease the shaft with 
Admax L3 or
Energrease LS3 and fit the countershaft
assembly to the spherical bearing and secure
with the two clips.
35. Examine the throttle stop lever 
ior wear, fit a
new lever if necessary.
’Continued
ADDITION: SEPT. 8867 
						

							.’
,Inspect and overhaul throttle valve
36.
37.Examine the throttle valve shaft for excessive
wear between the bearing bushes in the
plenum chamber and the shaft. A small
amount 
ofclearanceis permissible. If
excessive wear is evident fit new shaft and
bushes as follows.
Remove the two split screws securing the
throttle valve disc and withdraw the disc,
taking care not to damage the shaft.
m
FIR24iIOEKQ I-38. Remove the shaft and air seal from the plenum
chamber.
RR2401E39. Using a suitable drift, drive out the bushes
taking care not damage the bores in the
plenum chamber.
40. Press in new bushes until they are flush with
the throttle valve bore.
I8IRR2402E41.
42.
43.Fit the throttle valve shaft and disc, secure in
position with the two split screws. Do not fully
tighten the screws at this stage.
Rotate the throttle shaft 360” once or twice to
centralise the disc in the bore. Tighten the
two screws..‘(,Rotate the shaft until the split end of the
screws are accessible. Using the blade of a
screw driver spread the split to secure the
screws in the shaft.
RR2409E44. Pre-grease a new air seal with 
Admax L3 or
Energrease LS3. Fit the seal pushing it down
the shaft and into the counterbore until the
seal is 6.0 mm 
(0.236 in) below the face of the
plenum chamber.
JCAUTION: Ensure that the bushes do not
protrude into the bore as they will interfere
with the movement of the throttle valve
disc.
. .68
ADDITION: SEPT. 88 
						

							FUEL INJECTION
SYSTEM
Assemble throttle levers and bracket
45.
46.
47.
40.
49.
50.
51.
52Fit the stop lever to the throttle valve shaft
followed by a new tab washer and secure with
the interconnecting nut.
Holding the stop lever on its stop, tighten the
interconnecting nut securely and bend over
the tabs of the tab washer to lock the nut in
position.
Fit the inboard throttle return spring noting
that the small hooked end of the spring is
nearest the plenum chamber.
Locate the hooked end of the inboard spring
on the stop lever and wind up the straight end
one full turn and anchor it in the appropriate
slot.
Fit the countershaft to the interconnecting nut
of the throttle valve shaft.
Fit the throttle bracket assembly and secure
with the three retaining bolts.
Ensuring that the hooked end of the outboard
spring is anchored by the lever, wind the
spring up one full turn and locate the free end
in its appropriate slot.
Fit the over-travel spring.
Lightly grease the throttle return and over-travel
springs with Admax L3 or Energrease LS3.
5046 48
NOTE: If new throttle levers have been fitted the
minimum throttle setting of the disc must be
checked to ensure that it is SO” to the bore.53.
54.Using a depth vernier or depth micrometer
from the mouth of the bore check the top
and bottom of the valve disc. The disc must
be within 0.5 mm 
(0.019 in) total indicator
reading across the full diameter of the disc.
If the throttle disc is out of limits adjust the
small set screw below the stop lever. Access
to the screw is gained from the bottom of the
plenum chamber neck adjacent to the throttle
levers support bracket.
Refitting
55.
56.Reconnect and adjust the cruise control
actuator link. (See cruise control-actuator link
setting)
Clean any previous sealant from the joint face
of the plenum chamber and ram housing.
Apply 
‘Hylomar’ sealant to the faces and refit
the plenum chamber. Tighten the bolts to the
correct torque value-see section 06.
57.Reverse the remaining preparation instructions.
ADDITEON: SEPT. 88 
/ REVISED: MARCH SO69
.
:, 
						

							ELECTRONIC FUEL INJECTION-RELAYSELECTRONIC CONTROL UNIT (ECU)-14 CUIncorporated in the fuel injection electrical system
are two relays which are located beneath the front
right hand seat adjacent to the cruise control relay
and emission maintenance reminder. Access to the
relays is gained through the opening at the bottom
of the seat when the seat is in its fully forward
position on the seat slides.
1. Fuel pump relay (mounted on a blue terminal
block).2. Main relay (mounted on a black terminal
block).3. Diagnostic plug.
4. Condenser fan timer unit.
RR2555ERemove and refit
Removing1. Disconnect the battery negative terminal.
2. Pull the relay(s) from the terminal block(s).
Refitting
3. Reverse the removal procedure.
70ADDITION: SEPT. 88 / REVISED: MARCH 90NOTE: The ECU is not a serviceable item. In the
event of a unit failure the ECU must be replaced.
Remove and refit
Removing
1.
2.
3.
4.
5.
6.
7Remove the front and side seat base trim of
the front right hand seat.
Adjust the seat to its most rearward position
and raise the seat cushion height to allow
access to the ECU fixings.
Disconnect the battery negative terminal.
Release the ECU plug retaining clip.
Maneuver the front of the plug (in the
direction of the bold arrow) and detach the
other end of the plug from the retaining peg..
Release the two screws securing the ECU to
the mounting bracket.
Withdraw the ECU from the spring clip and
remove it from the vehicle.
,‘/
RR2667SRefitting
8. Refit the ECU securely in the spring clip and fit
and tighten the two screws.
9. Reconnect the ECU harness plug. Ensure that
the plug is pushed firmly into its location and
that the retaining clip secures the plug in
position.
10. Remove remaining removal procedure. 
						

							.., _. . --ROVER 
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RR2
26282942.3106
21lV”BI. I II,YBI’ WG-30
12527
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36301916225352033272239
17
955EFUEL 
INFECTION - Circuit Diagram - 1990/91 modelvear1. 40 
-way connector to Electronic Control Unit
(ECU).
2. Lambda sensor (left side 
- bank A).3. Lambda sensor (right side 
- bank 8).4. By-pass air valve (stepper motor) (fast idle).
5. Lambda sensor screened ground.
6. Fuse C4 
- main fuse panel.
7. Inertia switch.
8. Fuel pump.
9. Ignition switch.
10. Speed transducer (road speed input).
Il. Neutral switch (automatic gearbox) (load
input).
12. Main cable connector.
13. Battery.
14. Diagnostic plug.
15. In-line resistor.
16. Coil/-ve (engine RPM input).
1 
i. Coolanttemperaturethermistor(sensor)
(input).18. Fuel temperature thermistor (sensor) (input).
19. Throttle potentiometer.
20. Air flow sensor.
21. Fuel pump relay.
22. Main relay.
23. Injectors-l to 8.
24. Pick-up point E.F.I. warning symbol (instrument
binnacle).25. Heated front screen sense.
26. Purge control valve.
27. 
12\’ from fan relay.
28. Air conditioning output 
[email protected]. Air conditioning load input.
30. Fan relay feed.
31. Tune resistor (early vehicles).
32. Heater/air con. cable connector.
33. Condenser fan timer control.
34. Fault display input.
= = =Denotes screened ground.
NOTE: Reference to left and right side is made when viewing the vehicle from the rear.
ADDITION: SEPT. 89/REVISED: SEPT. 9071 
						

							FUEL INJECTIONSYSTEM1990 KANCltROVER
ELECTRONIC FUEL INJECTION
-LUCAS 14CUX SYSTEM
1990 model year vehicles have an enhanced fuel
injection system, using a Lucas 14CUX electronic
control unit, The system is a development of the
14Cu sytem introduced on 3.9 litre vehicles.The systemworks in the same way, new
components being a tune select resistor and a fault
code display unit.TUNE SELECT RESISTOR 
- RR281 1M
Rd28llM
The 14CUX system is used in various markets, but acommon ECU is used. To suit individual market
requirements a tune select resistor is connected
across pins 5 and 27 of the ECU.It is located adjacent to the ECU, and strapped to
the EFI cable assembly. The value of the resistor is
dependent on the market application.NOTE: For USA market models the resistor value
is 
3900 Ohms, wire colour, white.
NOTE: Vehicles after VIN No 451518 are fitted
with a new ECU, Part No. PRC 8747 to replace
PRC 7081. This ECU no longer requires the tune
select resistor, which is therefore deleted. Fault
code 
21 is no longer stored by the ECU.
17EM FAULT CODE DISPLAY UNIT - RR2814h-l
1990 model year vehicles have a fault code displayunit which is located underneath the right hand
front seat, adjacent to the EFI ECU. The unit will
display the relevant fault code, in addition to the
EFI warning light being illuminated.NOTE: Fault code 59 will NOT be indicated by
the EFI warning light.
Recommended equipment
The diagnostic equipment for checking out the
14CuX system is the same as that used for 14CU,with the addition of two new memory cards for
Hand Held Tester.
14CUX Memory cards, Lucas Part Number:
- 606 01 379.
CONTINUITY TEST PROCEDURE
NOTE: The continuity test procedure for 14CUX
systems is similar to that for 
14CU. Note the
addition of the tune select resistor test and the
deletion of Test 28, which does not apply to
14CUX systems.
,72ADDITION: SEPT. 
89iREVISED: SEPT. 90
(’
‘.‘:.rt. iv. .
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. . . . t” ;._.,. 
						

							Ki;;‘;ir 1990
FUEL INJECTION SYSTEM 119 1
.
TESTINGCONNECTIONS TO 40 WAY CONNECTOR
Release the ECU plug retaining clip and
remove the plug from the ECU. Access is
gained by removing the front seat base trim of
the right hand front seat.
Remove the plug shroud and manoeuver it
along the harness until there is enough
clearance to enable meter probes to be
inserted into the back of the plug.
There are six pin numbers 1, 13, 14, 27, 28
and 40 moulded onto the rear of the plug as
shown in the illustration below, for clarity the
electrical leads have been omitted.
272840
Pins1 to 13 bottom row.
Pins14 to 27 centre row.
Pins28 to 40 top row.
-14PIN Nos. CABLE COLOUR
1.Red/green
2.Brown/orange
3.Yellow
4.Blak
5.Grey/Black
6.Yellow
7.Green/blue
8.Purple/yellow
9.White/light green
10.Black/yellow
11,Yellow/white
12.Blue/red
I 3.Yellow/blue
14.Black
15.Brown
16.Blue/purple
17.Grey/yellow18.White/pink
79.
White/grey
20.Red
21.Yellow/black
22.Blue/red
23.Blue
24.
Blue25.Red/black
26.Green/white
27.
Black/grey28.
Bluelgrey29.Orange
30.
Pink
31.Black/green
32.
Creyhvhite33.
BlackIgrey
34.Orange/black
35.Blue/green
36.Black/green
37.Not used
38.Brown/pink
39.White/black
40.
BlackThe last colour denotes the wire tracer colour
.
ADDITION: SEPT. 89!REVISED: SEPT. 9073 
						

							‘.,
.‘....+
_:3: ‘.,,Tune select resistor test
lt is recommended that this test is carried outNOTE: This test is not required on vehicles after
before Test 1. of Continuity Test Procedure, SectionVIN No 451518, which are no longer fitted with a
19, page 44.tune select resistor.
FUNE SELECT RESISTOR TESTKEY 
1) Tune select resistor
Description of fault codes
The fault codes are listed in order of priority. Where
more than one fault exists, clearing the first fault
code will permit the next code to be displayed.
NOTE: Fault code 02 will show if the ECU has
just been reconnected. Switch on ignition to
clear the display.
Clearing fault code display
It is necessary to clear the code displayed when the
fault has been rectified, and to access any further
fault codes that may exist. Clear the fault code
displayed using the following procedure:
1.Switch On ignition.
2.Disconnect serial link mating plug, wait 5
seconds, reconnect.
3.Switch OFF ignition, wait for main relay to
drop out.
4.Switch ON ignition. The display should now
reset. If no other faults exist, and the original
fault has been rectified, the display will be
blank.
5.If multiple faults exist repeat Steps 1. to 4. as
each fault is cleared the code will change,
until all faults are cleared. The display will now
be blank.
74Code 29 
- ECU MEMORY CHECK - If this fault is
detected, all other faults are unreliable and must
therefore be ignored.‘I ,,Proceed as follows:
1.Leave battery connected
2.Switch ignition off
3.Wait for approximately 5 seconds
4.Disconnect ECU plug
5.Re-connect ECU plug
6.Switch ignition on and check display unit.
NOTE: If fault code 29 is detected again,
substitute ECU and restart test sequence.
Code 44 
- LAMBDA SENSOR A i left bank
Code 45 
- LAMBDA SENSOR B - right bank
If one of these fault codes is displayed check the
wiring to that particular lambda sensor.
If both codes are displayed, the 
volfage supply to
the heater coils of the sensors must be checked.
Refer to Test 26, continuity test procedure.
Code 25 
- IGNITION MISFIRE - This code indicates. . . . .that an ignition system misfire has been detected.
ICodes 40 or 50 indicate on which bank the misfire
has 
occured...’ . .,,1.,.ADDITION: SEPT. 
89/REVISED: SEPT. 90 
						

							FUEL INJECTION
SYSTEM
Code 40 - MISFIRE BANK A - left bank
Code 50 
- MISFIRE BANK B - right bank
If both fault codes are displayed check the
following components commom to both banks:
Distributor cap
Rotor arm
Coil
Electrical connections
Pick-up (air gap)
Amplifier
Injectors 
- if code 34 or 36 displayed.
If either fault code 40 or 50 is displayed check
components applicable to the particular bank that
the misfire has 
occured on:
.Spark plugs
HT leads
Distributor cap
Injectors 
- if code 34 bank A or 36 bank 6
displayed.
:.:.y. : .:.:$c.Code 
12 -AIRFLOW METER - Refer to Test 19,
continuity test procedure.
Code 21 
- FUEL TUNE SELECT - Identifies that the
tune select resistor is open circuit 
- Refer to tune
select resistor test.
Code 34
- INJECTOR BANK A - The display will
indicate if the injector/s are causing the engine to
run rich or lean.
If the bank is running rich, check for:-
- faulty injector wiring and connectors
- stuck open injectors
If the bank is running lean, check for:-
- faulty injector wiring and connectors
- blocked injectors
Code 36 
- INjECTOR BANK B - As code 34 except
relevant to bank A injectors.
Code 14 
- COOLANT THERMISTOR - Refer to Test
14, continuity test procedure.
Code 17 
- THROlTLE POTENTIOMETER - Refer to
Test 17, continuity test procedure.Code 18
- THROlTLE POTENTIOMETER input
high/AIRFLOW METER 
- low. - Refer to Tests 17,
18 and 19 of the continuity test procedure
Code 19 
- THROTTLE POTENTIOMETER input low/AIRFLOW METER 
- high. - Refer to Tests 17, 18
and 19 of the continuity test procedure
Code 88 
-PURGE VALVE LEAK - Refer to Test 9
and 10 of the continuity test procedure.
Code 28 
-AIR LEAK - Check for air leaks in the
following areas.
Hose, air flow meter to plenum
Breather system hoses to plenum
Brake servo hose
Vacuum reservoir hose (fresh air solenoid)
Distributor vacuum advance
Hose, purge valve to plenum
Injector seals
Joint 
- By pass air valve to plenum
- Plenum chamber to ram housing
- Ram housing to inlet manifold
- Inlet manifold to cylinder head
By pass air valve hose
Code 23 
-FUEL SUPPLY- Check fuel system
pressure, Test 20 of the continuity test procedure.
Code 48 
-STEPPER MOTOR - Check base idle
speed 
-see setting procedure. - Refer to Tests 15
and 16 of the continuity test procedure. Check
road speed sensor 
-Refer to Test 25 of the
continuity test procedure.
Code 68 
-ROAD SPEED SENSOR - Refer to Test
25 of the continuity test procedure.
Code 69 
- GEARSWITCH - Refer to Test 24 of the
continuity test procedure.
Code 59 
-GROUP FAULTS 23/28 - This indicates
that a fault has been registered that is caused by
the fuel supply or an air leak but the exact fault
cannot be identified. Check all items outlined under
code 23 and 28.
Code 15 
- FUEL THERMISTOR - Refer to Test 13 of
the continuity test procedure.
ADDITION: SEPT. 89/REVISED: SEPT. 90